Improvement in check-valves



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Check-Valves.

Patented 1an. 7, 1873.

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JOHN c. HOADLEY, or LAWRENCE, MASSACHUSETTS.

IMPROVEMENT IN CHECK-VALVES.

Specification forming part of Letters Patent No. lf, dated January 7, 1873.

To all whom t may concern: y

Be it known that I, JOHN G. HOADLEY, of Lawrence, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Boiler-Feed Apparatus 5 and I do hereby declare that the following, taken in counection with the drawing which accompanies and forms part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

In waterinjecting pumps of steam-boilers it is customary, to some extent, to introduce a globe-valve or a plug-valve between the boiler and the check-valve of the pump in order to shut off the boiler' from the pump, for access to the pump or dismemberment thereof, for repairs or other purpose. It is found in practice, however, that it is tb a highdegree objectionable to attach such a valve, as any neglect in reopening it after it has been closed for access to the pump-valves or chamber is sure to lead to an explosion, when the boiler is making steam, from failure of the pump to supply water. In this invention my purpose has been to supply a valve which, if accidentally or negligently left closed in shutting off the pump, will `be automatically opened by the pressure of the feed-water.

In carrying out my invention Iinterpose be-v c denotes the pump tube or pipe, having a chamber,b, in which is a cylindrical check-valve,

c, resting on a valve-seat, d, and raised by the pressure of the water forced up against it by the pump to enable the water to escape by its sides, between the bars c, up into and through the passage f into the boiler. Between the valve c and the passage f is a circular passage, g, the rim of which forms a seat, h, Vfor a cylindrical valve, i, attached to a vertical stem, k, passing through the neck l and a suitable stuffing-box, and raised and depressed bya handle, m, this valve iitting to its seat so that when closed the Valve is steam-tight, and the pressure of the steam keeps it to its seat.

Normally, the valve t' is raised and stays up by the friction of the stem in the stuffing-box. The check-valve c then rises and falls alternately by the pressure of the water and the back pressure of the steam 5 but when the boiler is to be disconnected from the pump the stem k is pressed down, forcing the valvet' against its seat It, as seen in Fig-2, where it is held tightly by the pressure of the steam. The pump mechanism is then accessible and may be removed 5 and when reconnected to the cylinder or case the pressure of the water will force up the valve t' if, from accident or other reason, it be left closed, it being impossible, with this valve mechanism, that connection between the boiler and pump shall be so closed that the reconnection cannot be again established by the direct pressure ofthe water without hand-manipulation of the valve-stem.

I claim- The arrangement within the body b, in theV manner substantially as described and for the purpose specified, of the two check-valves interposed between a boiler, in which .pressure is maintained, and a force-pump for feeding the boiler.

. JOHN C. HOADLEY. Witnesses:

GEO. It. CARTER, GEO. A. BARNARD. 

